Intent to Implement and Ship: Promise.any

We intend to implement and ship Promise.any, a proposed way to `await` several promises and continue as soon as any of them becomes fulfilled. André Bargull [:anba] has contributed patches implementing this feature. It will land in Nightly soon. We'll ship it once we're confident the specification

Intent to Ship: String.prototype.replaceAll()

String.prototype.replaceAll() is a convenience method for text processing. André Bargull [:anba] contributed the implementation of this feature. It's in Nightly now. The proposal is at Stage 3 of the TC39 Process[1]. Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1540021 Proposed standard: ht